5/16″ x 1.3/8″ Spring Steel Plain Tension Pin (Selock / Roll Pin)

Spring pins (also known as selock/selloc pins) have a body diameter larger than the hole diameter in the component being fastened, and a slight chamfer on the edge of the pins to guide the pin into the hole. A split in the pin allows compression and the force exerted by the pin against the wall of the hole locks it in place.